Soichiro Yamamoto’s Karakai Jouzu no Takagi-san (Skilled Teaser Takagi) is currently being serialized in Shogakukan’s Monthly Shonen Sunday and will release its ninth volume on 12 July 2018. The manga will be released in a regular and a limited edition which will include a special OVA.
On 26 March 2018, the anime series aired its last episode. The OVA will show Takagi-san inviting Nishikata to go swimming after they bought a swimsuit in Episode 7. Even though the anime has ended, the story continues on in the manga, so try reading it!